A reasonable analogy (though it's not nearly the same thing) for
Haskell classes is Java interfaces. e.g. in Java, Boolean is a class
that implements Serializable and Comparable, while Haskell's Bool type
is an instance of all those classes you listed. In Haskell, the
equivalent of Java's 'class Boolean implements Comparable<Boolean>
...' is 'instance Eq Bool where ... '. In Java you declare the
interfaces that a class implements when the class is declared. In
Haskell, you can add class instances to any type later, not just in
the module that declared the type.
Peter
2011/12/30 Stanisław Findeisen
Hi
What are those basic data type instances? For example here: http://www.haskell.org/ghc/docs/latest/html/libraries/base/Prelude.html#t:Bo... we have:
Instances
Bounded Bool Enum Bool Eq Bool Data Bool Ord Bool Read Bool Show Bool Ix Bool Typeable Bool Generic Bool Storable Bool
What is the difference between, e.g., Bounded Bool and Enum Bool?
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